At school, Lisa befriends a boy, who happens to be the son of mob boss. Fat Tony is put out of commission by a rival family, and Homer and Bart get involved with the mob, when Michael, who is nothing like his father, is not interested in the “family business”.

Marge gets a job as carpenter, but every man thinks she is going to ruin everything she fixes because she is a woman, so Homer pretends to be the carpenter while Marge does all the work, until he starts receiving too much credit for doing nothing.

In "Married to the Blob", Homer eats green extraterrestrial goo and morphs into a rampaging blob with an insatiable appetite; in "You Gotta Know When to Golem", Bart uses a golem; and in "The Day the Earth Looked Stupid," the residents of early-1930s Springfield refuse to believe news of an actual alien invasion after being duped by Orson Welles' War of the Worlds radio broadcast.

Homer is given an ice-cream van in memory of a ice-cream man, and becomes a tyrant to the community. Meanwhile, Marge finds a useful use for leftover ice-cream sticks - building sculptures of people in Springfield. The relationship between them hits a bump in the road when Homer crashes into Marge's sculptures, and Marge won't forgive him, whatever he tries.

Nelson invites the whole of Bart's class to his birthday, but Bart and Martin convince the others not to go. Bart is forced to go to Nelson's birthday by Marge, and ends up becoming friends with Nelson.

During an outdoor movie event, Marge remembers when she went to Barnacle Bay, an island she used to go when she was a child. Homer takes her to the island, but when they arrive they discover it has become very poor.

After the Simpsons' car is cut off by the Rich Texan, Homer's lust for revenge prompts his family to tell three stories of vengeance, hoping to convince Homer that pursuing revenge is not a good idea.

1.The Count of Monte Fatso
Marge offers a cautionary tale of revenge from Nineteenth-Century France, based on Alexandre Dumas's The Count of Monte Cristo.
2.Revenge of the Geeks
Lisa's story revolves around Milhouse's campaign to fight back against the school bullies, and the consequences when he goes too far.
3.Bartman Begins
Bart recounts Bartman's "origin story", based on Batman's origin as revealed in the film Batman Begins.

After turning off a big fire, Bart is rewarded with a driving license. However, he gets tired of taking Homer everywhere, so he escapes and meets a teen girl that falls in love with Bart. Meanwhile, Lisa says she is a descendant from a fake Native American tribe for an school work.

Declan Desmond films a documentary about the lives of people of Springfield and how they changed over the years. Homer makes him believe he is rich, but he actually took Burns' manor while Mr. Burns was out.

Marge discovers the Internet and gets hooked on an online fantasy role-playing game called Earthland Realms, where she interacts with practically everyone in Springfield, including Bart, whose online persona is the local tough guy, the Shadow Knight. Meanwhile, Homer becomes a soccer referee, which strains his and Lisa's relationship when he has to call penalties on her.

After Homer takes pills to help him sleep and crashes into the Springfield Fire Department, He, Apu, Principal Skinner and Moe Szyslak become voluntary firemen and begin to steal property from the homes of fire victims.

Homer unwittingly drags the family into a cornfield maze after attempting to leave a boring Harvest fest that Marge brought them to. When everyone except Homer escapes, Santa's Little Helper rescues him and becomes the town hero. So the Simpsons enroll him in Police Dog Academy where he's teamed with Lou.

When Homer buys the 1,000,000th ice-cream cone at a local shop, he ends up on Kent Brockman's news program. When Brockman swears on live TV after coffee is spilled in his lap, Ned Flanders leads a crusade to clean up Springfield's airwaves, starting with getting Brockman fired. Then Homer once again saves the day.

Robert Canning of IGN gave the season a 6.6 saying it was "Passable" and that "Now in its eighteenth season, The Simpsons continues to supply America with a decent half-hour of comedy every Sunday night. However, most long-time fans of the show agree that the last several years have seen the program in constant decline. Looking back at this particular season, there's little evidence to prove them wrong. Though we were treated with at least a few hilarious gems this year, the mediocre heavily outweighed the great."[1]